[Noisebridge-discuss] New Multimeter needed....

jim jim at well.com
Mon Jan 24 12:01:27 PST 2011


    How about a reference of people who've got stuff 
they're willing to loan to others? (i like pieces of 
paper in the space rather than the tedious process 
of booting up a computer, loading applications, 
clicking the mouse, finding a web site, clicking the 
mouse, getting a headache trying to find something 
that's useful, and finally getting an out-of-date 
page of kind-of-okay info. 
    At least the piece of paper is easy to get to. 



On Mon, 2011-01-24 at 11:17 -0800, John E wrote:
> Jim,
> 
> 
> I was under the impression borrowing any equipment, books etc. from
> noisebridge was considered unexcellent, especially when people are
> "sloppy" about returning it.
> 
> 
> Perhaps we should consider having a lockable "crate" with the
> expensive test equipment and dev boards, so that random people can't
> walk off with it.
> 
> 
> Regards,
> John
> 
> 
> On Mon, Jan 24, 2011 at 11:06 AM, jim <jim at well.com> wrote:
>         
>         
>            Holy Moly! Thanks for the link to the $6 MPJA meter!
>         
>            For me, el cheapos work great, but i do power supply
>         and audio work where most of the measurements are
>         discovering catastrophic failures and continuity.
>            I'd love to know detailed criteria for assessing a
>         multimeter. One approach might be to point to the specs
>         of a good model (fluke 17{5,7,9}, which i looked up).
>            But it'd be really helpful to understand the why of
>         each criterion: in measuring capacitance, what are the
>         use cases and acceptable tolerances? For me, if the RC
>         figure allows, I can look to see if the "needle" moves
>         to know if it's working (can't do that with pfs, of
>         course); cap tolerances for me are +-50%, give or take....
>            Is there a need for a does-all meter or is it
>         acceptably useful to have a reasonably good VOA meter
>         along with separate cap and L measurement tools (maybe
>         a frequency generator and scope...)?
>         
>            As to "Why We Can't Have Nice Things at Noisebridge",
>         that issue makes me furious!
>            It's horribly inconsiderate to take things away: I'm
>         guessing mainly it's a sloppy, selfish mentality to the
>         effect that "I'll just use it and bring it back after
>         I'm done", which very often fails to "I'll just use it
>         and let it sit around unused and forgotten somewhere at
>         my house forever more after I'm done."
>            Possible approaches include
>         * We Can't Have Anything Nice at Noisebridge
>         * People can bring in their personal nice things and
>          label them and put them in their member shelves and
>          loan them out when/if they see fit.
>         * Have a checkout system for some things--probably a
>          signout sheet: probably a fair number of people will
>          sign stuff out before they take things home and leave
>          them there, and when asked, they'll probably be able
>          to find the things and bring them back.
>         
>         
>         
>         
>         
>         
>         On Mon, 2011-01-24 at 09:11 -0800, Jonathan Foote wrote:
>         > Hey Zach, thanks for noticing! But I'm with  Dr. J. here.
>         >
>         > I wouldn't get a Fluke, it will just walk like the last one.
>         (Another
>         > demonstration of Why We Can't Have Nice Things at
>         Noisebridge.) Sounds
>         > like you could use one for yourself, though!
>         >
>         > I have a spare El Cheapo I can donate. I'll bring it tonight
>         and slap
>         > some stickers on it.
>         > For the price of a Fluke we can get a few of these $6 ones
>         which will
>         > work great for 99% of anything we want to do at NB.
>         > (How many people not doing power engineering really need
>         accurate
>         > capacitances > 400 uF?)
>         >
>         >
>         http://www.mpja.com/Category/Test_Equipment/Digital_Multi_Meters/LARGE_CHARACTER__LCD_MULTIMETER_17191_TE.asp
>         >
>         > As Dr. J mentioned we can loan ya an expensive one should
>         you need it.
>         >
>         >
>         >
>         >
>         > On Sun, Jan 23, 2011 at 10:52 PM, Dr. Jesus <j at hug.gs>
>         wrote:
>         > >
>         > > I've noticed that the people who need a trustworthy DVM
>         just bring their own.  I have a pretty nice one you can borrow
>         if that will help get some of the LCDs working.
>         > > On Sun, Jan 23, 2011 at 10:46 PM, Zach .
>         <organic_unity at yahoo.com> wrote:
>         > >>
>         > >> Hey folks,
>         > >>
>         > >>    Zach here and this is my first attempt at posting to
>         the email list.  I'm writing this because I believe we
>         desperately need a new multimeter to work with and am not sure
>         how to go about the process of noisebridge getting one.  But
>         allow me to explain first...
>         > >>
>         > >> noisebridge used to have a very nice Fluke multimeter
>         that went missing some months ago.  I have looked all over for
>         it but it has yet to turn up.  I am in the process of
>         repairing some LCDs for noisebridge (got one working already)
>         and could be saved a great deal of time and effort with a
>         better multimeter.  The best one we have now is a "Vichy"
>         brand.  I personally find it incredibly low quality and a very
>         large pain to use.  And its capacitance readout maxes out
>         under 400uf...which is a joke.
>         > >>
>         > >> I recommend we collect donations for this very important
>         electrical tool for the benefit of noisebridge and everyone
>         else at the space.  Great Fluke meters are inexpensive these
>         days and a quick ebay search pulls up one at a good price:
>         > >>
>         > >>
>         http://cgi.ebay.com/FLUKE175-TRUE-RMS-MULTIMETER-EXC-CONDITION-CASE-/190484916097?pt=LH_DefaultDomain_0&hash=item2c59c92781
>         > >>
>         > >> the Fluke 175 is a superb meter measuring capacitance to
>         10,000uf or TWENTY TIMES higher than our current best meter.
>          This will make repairs far easier.  It also has RMS frequency
>         reading, high voltage (600v), and is far more accurate.  It
>         also reads more than twice as fast.
>         > >>
>         > >> so....what do people think?  sorry I don't know how this
>         process is supposed to work, people just told me to post to
>         the list so here I am...
>         > >>
>         > >> best,
>         > >> Zach
>         > >>
>         > >>
>         > >> _______________________________________________
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>         > >>
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>         > >>
>         > >
>         > >
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